Well I have completed a wee series of collages in photoshop based on blue, birds and moons. I think that they are tomtits, not bluebirds and they are not nocturnal . . . but hey.
There are so many amazing resources online that you can add to your own. I had just as much fun creating these images as I do with more lo-tech collage techniques, normally I dislike using the computer too much.
Vintage patterns have been brought into all of them, in some cases ever so subtly, which work wonderfully with the retro imagery. I think these will become a card pack as they lend themselves nicely to that format and are cute and chirpy.